SOLUTION: A wallet contains $1, $5 and $20 bills. The number of $5 bills is equal to the sum of the other bills. If the wallet contains ten bills total, how many $5 bills does it contain?

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Question 106273: A wallet contains $1, $5 and $20 bills. The number of $5 bills is equal to the sum of the other bills. If the wallet contains ten bills total, how many $5 bills does it contain?
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
Let $1 bill be x, $5 bill be y and $20 bill be x.
if the number of $5 bills is equal to the sum of the other bills, we can write:
x+=+y%2Bz
If the waellt contains ten bills total, we can write:
x+%2B+y+%2B+z+=+10
since x+=+y%2Bz we can substitute it
y+%2B+z+%2B+y+%2B+z+=+10
2+Y+%2B+2+z+=+10
2%28y%2Bz%29+=+10 ..........divide both sides by 2
y%2Bz+=+5 .... if this is 5, => that x+=+5
the waellt contain five $5 bills.